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This page is devoted to frequently asked questions (FAQ) related to the Bridge Modeler. Please note that this page applies to both CSiBridge and the bridge modeler, available with SAP2000 releases through version 14. |
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Model development
Frequently asked questions associated with model development are discussed as follows:
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- Multi-mode spectral method
- Time-history method
CSI Software enables analysis using any of the methods listed. The uniform-load and single-mode spectral methods are essentially equivalent static methods, for which response may be determined under equivalent static loading.
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Answer: Analysis moments are calculated through the analysis process, while design moments are retrieved from analysis results only when the live-load distribution method is specified in the design request by selecting Use Direct Girder Forces from Analysis. Otherwise the total bridge-section moment is divided by the number of girders, then applied to each girder for non-live design forces.
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Reviewing Results
Frequently asked questions associated with reviewing results are discussed as follows:
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Answer: In the Bridge Object Response Display menu, jumps in the frame moment diagram at node locations are caused by a portion of the total moment acting on the composite section being carried by bridge deck elements. The total moment across the entire deck should be continuous.
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Related Email (tc → -, 2008-07-11, -): - |
How are bridge force and stress diagrams obtained?
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Answer: The request for saving section forces should be made such that bridge objects return the proper response during moving-load analysis.
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Is there an explanation for why my spine bridge model exhibits uplift and unexpected bearing response?
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Answer: At a given substructure unit, a spine bridge model uses a single body constraint to connect a superstructure frame-element joint to all other joints which represent the top of bearing links. While this modeling approach is adequate to obtain global structural response, it does not fully capture the distribution of superstructure load to individual bearings. For bearing and pier-cap design, users should update the Linked Bridge Model as an Area Model to compute more meaningful bearing forces.
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